2528509 has 4 divisors (see below), whose sum is σ = 2536480. Its totient is φ = 2520540.

The previous prime is 2528503. The next prime is 2528527. The reversal of 2528509 is 9058252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2528509 - 2⁹ = 2527997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2528503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3489 + ... + 4150.

It is an arithmetic number, because the mean of its divisors is an integer number (634120).

2^2528509 is an apocalyptic number.

It is an amenable number.

2528509 is a deficient number, since it is larger than the sum of its proper divisors (7971).

2528509 is an equidigital number, since it uses as much as digits as its factorization.

2528509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7970.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2528509 is about 1590.1286111507. The cubic root of 2528509 is about 136.2348343247.

The spelling of 2528509 in words is "two million, five hundred twenty-eight thousand, five hundred nine".